Broadcom ACNT-H87B/H87A/H870 voltage sensor

In a typical voltage sensing implementation, a resistive voltage divider is used to scale the DC-link voltage to suit the input range of the voltage sensor. A differential output voltage that is proportional to the input voltage is created on the other side of the optical isolation barrier. For general applications, the ACNT-H87A (±1% gain tolerance) and the ACNT-H870 (±3% gain tolerance) are recommended, for high precision requirements, the ACNT-H87B (±0.5% gain tolerance).

Key features

• Excellent linearity
• Ideal for battery-powered and power-sensitive applications
• 2-V input range and high 1-GΩ input impedance
• Well suited for isolated voltage sensing requirements

Additional features

• Advanced sigma-delta (Σ–Δ) modulation technology
• Unity gain 1V/V, ±0.5% high gain accuracy (ACNT-H87B)
• 1-GΩ input impedence
• 0 to 2V nominal input range
• 35 ppm/°C low gain drift
• 21 μV /°C offset voltage drift
• 0.1% non-linearity maximum
• Active-high shutdown pin
• 100-kHz wide bandwidth
• 3-V to 5.5-V wide supply range for output side
• Operation from a single 5V supply
• –40°C to +110°C operating temperature range
• 15 kV/μs common-mode transient immunity
• Compact, auto-insertable 15-mm Stretched SO-8 package
• Active-high shutdown pin is available, reducing the IDD1 current to only 15 μA
• Safety and regulatory approvals:
• IEC/EN/DIN EN 60747-5-5: 2262 Vpeak working
• insulation voltage
• UL 1577: 7500 Vrms/1 min double protection rating
• CSA: Component Acceptance Notice #5

Applications

• Isolated voltage sensing in AC and servo motor drives
• Isolated DC-bus voltage sensing
• Isolated sensor interfaces
• Signal isolation in data acquisition systems
• General-purpose voltage isolation
• Motor drives and renewable energy systems
• Solar inverters, wind turbine inverters